diff --git a/scim-wnn/src/scim_wnn_imengine.cpp b/scim-wnn/src/scim_wnn_imengine.cpp
index aa54bbe..c1277b1 100644
--- a/scim-wnn/src/scim_wnn_imengine.cpp
+++ b/scim-wnn/src/scim_wnn_imengine.cpp
@@ -281,6 +281,9 @@
             update_preedit_string(wnn.getText(),wnn.getAttributeList());
             update_preedit_caret(wnn.getCaretPos());
         }
+        if (alp == -1) {
+            if (!m_lookup) startLookup();
+        }
         return(true);
     } else
     if (k_commit.comp(key)) {
@@ -407,9 +410,13 @@
         m_convList = wnn.getConversionList();
         update_preedit_string(wnn.getText(),wnn.getAttributeList());
         update_preedit_caret(wnn.getCaretPos());
-        hide_lookup_table();
-        hide_aux_string();
-        m_lookup = false;
+        if (alp == -1) {
+            startLookup();
+        } else {
+            hide_lookup_table();
+            hide_aux_string();
+            m_lookup = false;
+        }
         alp_count = 1;
         return(true);
     } else
@@ -418,9 +425,13 @@
         m_convList = wnn.getConversionList();
         update_preedit_string(wnn.getText(),wnn.getAttributeList());
         update_preedit_caret(wnn.getCaretPos());
-        hide_lookup_table();
-        hide_aux_string();
-        m_lookup = false;
+        if (alp == -1) {
+            startLookup();
+        } else {
+            hide_lookup_table();
+            hide_aux_string();
+            m_lookup = false;
+        }
         alp_count = 1;
         return(true);
     } else